Tyler Crowley's famous storytelling video should give you some really useful directions. I cannot find the video reference but a quick summary of what he says is available at: http://pollenizer.com/pitch-clinic-summary-tyler-crowley/

A few keywords from what Tyler says are: Personas. First 15 seconds to engage. 8 out of 10 rather than 2 million users. Mental movie to setup the context.

PS: I have not pitched for myself but I have helped companies prepare their most important slide deck!-